Fall HVAC Checklist for Las Vegas Homeowners: Preparing for Winter
Las Vegas fall is the window most homeowners overlook. The AC finally stops running constantly, the weather turns pleasant, and the heating system — which hasn't run since roughly March — sits ignored until the first genuinely cold night in November or December. That's exactly when problems announce themselves, usually at the worst possible time. Here's a practical checklist to work through in October and November.
1. Run the heat before you need it
The simplest and most valuable thing on this list: on a mild fall day, switch the thermostat to heat and set it above the current room temperature. Let the system run for 10-15 minutes. You're checking that it starts, that warm air actually comes from the vents, and that nothing unusual happens — no strange smells beyond a brief dust burn-off, no odd noises, no failure to ignite. Discovering a problem on a 70°F October afternoon means you have time to address it. Discovering it on a 32°F December night means competing with every other household in the same situation.
2. Replace the air filter
The filter that's been catching desert dust all summer is likely loaded. A clogged filter restricts airflow through the heating system just as it does for cooling, forcing the furnace to work harder and, in some cases, causing safety limit switches to shut the system down. Starting the heating season with a fresh filter is a small step with outsized impact.
3. Check and clear the outdoor unit (heat pump owners)
If you have a heat pump, the outdoor unit runs in winter too — it's the same equipment that cooled your home all summer, now running in reverse. Clear any debris, leaves, or overgrowth from around the unit, and make sure nothing is blocking airflow. Heat pumps also need clearance for the defrost cycle to work properly, so anything piled against the unit should be moved.
4. Test the thermostat, including batteries
Dead thermostat batteries are a surprisingly common cause of "the heat won't turn on." Replace them proactively in fall rather than diagnosing them in the cold. If you have a programmable or smart thermostat, this is also the time to update the schedule for heating season — the cooling schedule you set in May probably doesn't match your winter comfort preferences.
5. Check your vents and registers
Walk the house and confirm supply registers are open and not blocked by furniture, rugs, or seasonal decorations. Blocked registers create pressure imbalances that reduce system efficiency and can cause uneven heating. Return air grilles need clearance too.
6. Test your carbon monoxide detectors
If you have a gas furnace, working CO detectors are non-negotiable before heating season starts. Press the test button on each one, replace batteries, and check the manufacture date — CO detectors have a limited service life (typically 5-10 years) and need replacement when expired, regardless of whether they still respond to the test button.
7. Look for obvious duct issues in accessible areas
In accessible attic or crawl space areas, look for disconnected duct runs, obvious tears, or crushed flex duct. Heating losses through compromised ductwork are the same problem as cooling losses — conditioned air escaping before it reaches living space.
8. Schedule professional heating maintenance
The checks above are what a homeowner can reasonably do. A professional heating inspection covers what you can't: heat exchanger inspection for cracks (a genuine safety issue on gas furnaces), burner operation and combustion testing, flue and venting inspection, electrical component testing, and for heat pumps, refrigerant charge and reversing valve operation. Fall is also simply the easier time to schedule — HVAC companies are less slammed in October than they are during the first cold snap.
Why fall specifically, and not later
Las Vegas heating season is short but real. Overnight lows drop into the 30s regularly in December and January, and the valley occasionally sees freezing temperatures. The practical argument for fall prep is availability: a repair scheduled in October happens on a normal timeline. The same repair needed during the first genuine cold snap competes with a valley full of systems that all failed the same week.
Aspen Air provides heating inspections and repair across Las Vegas, Henderson, Summerlin, North Las Vegas, and the surrounding valley. Call (702) 612-2980.